A knife attacker killed a two-year-old child and a man on Wednesday in a public park in Germany, where police arrested an Afghan man as the main suspect.

German police say two people, including a child, were killed and two others were severely injured in a stabbing attack in Bavaria

BERLIN—German police detained an Afghan man suspected of stabbing two people to death, including a 2-year-old, putting immigration back at the center of the campaign for next month’s election. Armed with a kitchen knife,